SEGMENT REPORTING, Reconciliation of operating Income to Consolidated Income (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2017	Mar. 31, 2016
Adjustment for [Abstract]
Amortization of intangible assets	$ 4,316	$ 4,528
Income (loss) from operations	8,236	(2,002)
Interest expense	3,653	3,409
Other expense (income), net	(228)	(155)
Income (loss) before provision for income taxes	4,811	(5,256)
Reportable Segment [Member]
Segment Reporting Information [Line Items]
Operating income for reportable segments, excluding amortization	20,908	13,322
Adjustment for [Abstract]
Income (loss) from operations	16,592	8,794
Reportable Segment [Member] \| Service Centers [Member]
Adjustment for [Abstract]
Income (loss) from operations	11,090	7,241
Reportable Segment [Member] \| Innovative Pumping Solutions [Member]
Adjustment for [Abstract]
Income (loss) from operations	1,715	(1,656)
Reportable Segment [Member] \| Supply Chain Services [Member]
Adjustment for [Abstract]
Income (loss) from operations	3,787	3,209
Segment Reconciling Items [Member]
Adjustment for [Abstract]
Amortization of intangible assets	4,316	4,528
Corporate expense	$ 8,356	$ 10,796

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Operating income for reportable segments before amortization of intangibles, corporate and other expense, net.

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The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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The aggregate total of expenses of managing and administering the affairs of an entity, including affiliates of the reporting entity, which are not directly or indirectly associated with the manufacture, sale or creation of a product or product line.

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Amount of income (loss) from continuing operations, including income (loss) from equity method investments, before deduction of income tax expense (benefit), and income (loss) attributable to noncontrolling interest.

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Amount of the cost of borrowed funds accounted for as interest expense.

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